Magnetic-field-controlled spin fluctuations and quantum critically in Sr3Ru2O7

C. Lester, S. Ramos, R. S. Perry, T. P. Croft, M. Laver, R. I. Bewley, T. Guidi, A. Hiess, A. Wildes, E.M. Forgan, S. M. Hayden*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

When the transition temperature of a continuous phase transition is tuned to absolute zero, new ordered phases and physical behaviour emerge in the vicinity of the resulting quantum critical point. Sr3Ru2O7 can be tuned through quantum criticality with magnetic field at low temperature. Near its critical field Bc it displays the hallmark T-linear resistivity and a T log(1/T) electronic heat capacity behaviour of strange metals. However, these behaviours have not been related to any critical fluctuations. Here we use inelastic neutron scattering to reveal the presence of collective spin fluctuations whose relaxation time and strength show a nearly singular variation with magnetic field as Bc is approached. The large increase in the electronic heat capacity and entropy near Bc can be understood quantitatively in terms of the scattering of conduction electrons by these spin-fluctuations. On entering the spin density wave (SDW) phase present near Bc, the fluctuations become stronger suggesting that the SDW order is stabilised through an "order-by-disorder" mechanism.
Original languageEnglish
Article number5798
Number of pages6
JournalNature Communications
Volume12
DOIs
Publication statusPublished - 4 Oct 2021

Bibliographical note

Funding Information:
We acknowledge informative discussions with P. Coleman, A. Chubukov, R. Evans, A. Green, G. G. Lonzarich, M. Zhu and A. P. Mackenzie. Our work was supported by the UK EPSRC (Grant nos. EP/J015423/1 and EP/R011141/1).

Publisher Copyright:
© 2021, The Author(s).

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